franzen



L.l A.l FIIANZEN.

GRINDING AND CUTTING MACHINE. APPLICATION FILED JAN. 2p. IQ'IB.

Q1 fy- L. A. FRANZEN.

GRINDING `AND CUTTING MACHINE. APPLlCATlON FILED JAN. 26, 1918.

1,306,423. Patented June 1o, 1919.

2 SHEETS-SHEET 2.

[N VEN TOR.

ATTORNEY LEIEARD A. FRANZEN, OF BROOKLYN, NEW YORK.

'GRNDING AND CUTTING MACHINE.

Specification or Letters Eatent.

Patented June 1o, 1919.

Application lecl January 26, 1918. Serial No. 213,925.

To NZZ lc/icm 'if may concern Be it known that l, LEONARD A. FRANZEN, asubject, of King Gustavus V. of Sweden, and a resident of 4918 Seventhavenue, borough .of Brooklyn, in the county of `ings, city and State ofNew York, have invented certain new and useful Improvements in Grindingand Cutting Machines, of which the following is a specification.

This invention relates to thread cutting and grinding machines, andespecially to that class wherein the work is mounted. between centerswhich are supported upon a movable common bed which in turn is slidablymounted upon a fixed bed provided at one end with a feed screw to bothrotate the work and simultaneously slide the movable bed upon the fixedbed, and provided upon one side with a swiveling grinder adapted toengage the work between the centers.

y (lne advantage of this invention is to provide a grinding and cuttingapparatus that can bel easily and quickly adjusted tothe nicestaccuracy.

Y:inother advantage is to provide 'a machine furnished with a stationarybed bearing thereupon a longitudinally slidable bed guided in itsmoven1e..t by a feed screw mounted onsaid stationary bed.

Another advantage is'to provide an adjustable grinder apparatus whichmay be accurately adjusted at sight without measuring instruments.

Another advantage-is to provide a grinder furnished with a platewhereupon a sharpening device may be supported and guided in engagementwith the grinder.

A Vfurther advantage is to provide a grii-ider sharpening device withAdouble adjustuients to take up the wear on the same and the dieringsizes of grinding wheels.

Further possibilities will become apparent.

the specification proceeds.

in the drawings. Figure l is a view of an 'apparatus embodying thepresent invention with a ring 21 in vertical. section. Fig. Q, an endview of eccentric ring .21 and feed nut; i of Fig. 1.

ll'ig. 3 is a view of a feed nut and feed bushing which areinterchangeable with nut l and bushing 25% of 1. Fig. flis a view of.screw s ,i idle il!) of Fig. 1. Fig. 5 is a vertical c s' sectionalview of Fig. l. on line ii f7. l n a mfnlification. Fig.

i is an end view of the part of Fig. 1 above Afluous to illustrate.

d1 in operative position. Fig. 8 is a plan view ofthe same part'cf Fig.1.

Throughout the views, like numerals refer to the same parts.

Through long experience with screw cutting lathes and other machines forcutting threads, it has been found that these machines are not accurateenough for plug gages, ring gages or the like, when the finished surfaceis considered. These machines are used for roughing out this kind ofwork previous to hardening the work, after which a finish is produced bylapping the threads to size with much labor and expensive time. It isintended to eliminate this labor and waste of time by utilizing thepresent in-l Referring to the drawings, 37 is a sta.v

tionary bed supported on a' bench or stand by means well known to thetrade and super- The end block 36 is pern'uinently fixed to bed 37 andsupports an internally threaded collar 4 which is fixed to the same byscrews as indicated at 5. The coll-ar for this purpose is provided withholes noted 8 and is fitted with exterior' eccentric ring 21 which bymeans of a set screw may tighten collar 4 till it engages feed bushing'23 without any back lash whatever. The bed 39 is slidable along bed37', being nicely adjusted to prevent all play or rattle, and bears onone end a tail stock 18. llpon the other end is permanently fixed a headstock 38 which bears a hollow shaft Q9, into one end of which is fixedthe head `end 31 of screw spindle 30 by means of set screws, and intothe other end'lllwhich bears face plate 13 is set a center. Shaft 29 islimited between the flange under dust cap 19 and collar 17, and may berotated by the pulleys l0. lt is to be noted that screw spindie 30 mayreceive interchangeable feed bushings 223 or li or any other of a seriesof like bushings. between the nuts 2T and 2S on thread 2li. The wheel 34may then be fitted on extension and a nut secured outside of it.Naturally, if 21 were to replace 23. fl, as the threads are different.`cach nut, however` being provided with a shoulder Q2 to center the samein 9.6 and using an exterior ring 21 for adjustment. It is seen that thefeed screw 30 has a reduced porthe feed nut 9 would also replace nuttion between the head and the threaded. portion. This is provided torender the shank slightly flexible so that thethreads will not bind incase `the bushing 23 is not accurately in line With shaft 29.

If the handle be used to rotate shaft 29,

lthe whole bed 39 and all its appurtenances move along on bed 37 inaccord with the pitch of the threads in nut 4 and on hush-4 ing 23.

Vlbolt andhas a vertical portion 2 of special construction as willappear.

The bearing block of grinder 11 has three shoulders 3, 6 and 16 cut on aradius centering on center lines v and c, the rib or l.shoulder 'Gfitting into a corresponding groove in plate-2, while nut 12 secures thegrinder in any set position, the markings on 16 and on 2 serving toreadily set 2 at any angle at sight. Thus it is easily possible tosecure a position indicated at e, or even at an opposite angle, thehorizontal diametral central line of Wheel 11 at all times remainingtrue to the center line e without any ca're being necessary to set itcentral. Itis then to be noted that if the grinder is set at the samepitch as that of the feed bushing 23 it will accurately grind a threadon a piece of stock 44. If we lengthen the grinder shaft as at 7 andreduce the wheel diameter, inside threads may be cut, the ring 14illustrating one form of this class of work. As the shaft 7 is longerthe block 1G and eX- tension 43 will conform to an entirely differentradius from that in Figs. l', 7, and 8. The internally threaded ring 54is not in operative position but is simply hung on the grinder to showthe agreement between the wheel and the threads. ln the illustrated formof my invention, a belt from a motor or counter-shaft may rotate pulley33 while pulleys 10 may be rotated from the same power source `byanotherl belt at a low speed.

speed. and positive Naturally a` gear head stock 38 so as to secure theproper low drive. However, the form shown clearly reveals that shaft 29may be manually rotated and be entirely independent of the rotation ofthe grinder.

It is manifest that some of the details such as dust cap on the grinderor cross feed 1 and 40 are not claimed to be new, nor do I claim them assuch. However, modifications such as have been herein men-A tionedldesire to reserve, and any others within the Widest limits commensuratewith the scope of my invention.

Having thus fully described my invention, l claimq 1. A. grinding andcutting machine including a stationary bed provided with a feed on theend thereof, a slidable bed adapted to travel upon said first bed to andfrom said feed block, a bearing head upon. said slidable bed and a shafttherein adapted to receive a lathe center and face plate, afeed screwspindle secured to the free end of Said shaft to rotate the same,threaded feed bushing secured upon said spindle, a corresponding feednutengaging said bushing secured to said feed block, providing travel ofsaid slidable bed upon said stationary bed by rotation of said feed anexternally box might be built into bushing in said feed nut, said feednut and bushing being a pair of a series of interchangeable nuts andbushings.

2. A feeding mechanism including a spindle having a threaded portion, areduced portion and a head, an externally threaded bushing secured uponsaid threaded portion of the spindle, an internally threaded collarsecured partially in a post engaging the thread of said bushing, aclamping ring on said collar near said post and a shaft to be movedalong its axis engaging said head of said spindle. l

Signed at 132 Nassau street, in the lborough of hlanhattan,` in thecounty of New York, city and State of New York, this 23rd day ofJanuary, 1917.

LEONARD A. FRANZEN.

Witnesses:

ELLAS JoliNsoN, (l. F. WM. Fonssnae.

